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Using a coffee-cup calorimeter. 30.0 g of ammonium nitrate is dissolved in 250 g water which is initially at 20.0 °C. Calculate the final temperature of the water, assuming no heat is lost to the surrounding environment. [Assume that the specific heat capacity of the calorimeter is the same as pure water, Cs, water = 4.184 J/(g °C)] NH4NO3(s) → NH4+(aq) + NO3–(aq); ΔH = +21.1 kJ/mol